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<p>This study explores the optical and dielectric properties of MnFe<sub>2</sub>O<sub>4</sub> nanoparticles synthesized via the co-precipitation method and their application in rhodamine B (RhB) photocatalytic degradation under visible light. Structural characterization confirmed the formation of a highly crystalline spinel ferrite with a coral-like porous morphology, enhancing the surface area for photocatalysis. X-ray photoelectron spectroscopy (XPS) analysis revealed Mn<sup>2+</sup>/Mn<sup>3+</sup> and Fe<sup>2+</sup>/Fe<sup>3+</sup> oxidation states, promoting charge transfer. Optical studies showed a narrow band gap (1.32&#xa0;eV) and a valence band maximum at 1.07&#xa0;eV, enabling efficient visible-light absorption. Dielectric analysis demonstrated strong polarization and minimal energy loss, facilitating charge retention. Photocatalytic experiments achieved 68.51% RhB degradation in 90 min, following pseudo-first-order kinetics (0.00932 min<sup>−1</sup>). Reusability tests confirmed 75% efficiency retention after six cycles. These results highlight MnFe<sub>2</sub>O<sub>4</sub> as a promising, stable, and reusable photocatalyst for organic pollutant degradation and environmental remediation under visible light irradiation.</p>

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Unveiling the Optical and Dielectric Properties of MnFe2O4: A High-Performance Visible-Light Photocatalyst for Sustainable Rhodamine B Degradation

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Khaled Derkaoui,
  • Ismail Bencherifa,
  • Amel Elfiad,
  • Yamina Mebdoua,
  • Ilyes Belkhettab,
  • Khadidja Boukhouidem,
  • Soumia Benredouane,
  • Toufik Hadjersi,
  • Amar Manseri,
  • Mohamed Kechouane

摘要

This study explores the optical and dielectric properties of MnFe2O4 nanoparticles synthesized via the co-precipitation method and their application in rhodamine B (RhB) photocatalytic degradation under visible light. Structural characterization confirmed the formation of a highly crystalline spinel ferrite with a coral-like porous morphology, enhancing the surface area for photocatalysis. X-ray photoelectron spectroscopy (XPS) analysis revealed Mn2+/Mn3+ and Fe2+/Fe3+ oxidation states, promoting charge transfer. Optical studies showed a narrow band gap (1.32 eV) and a valence band maximum at 1.07 eV, enabling efficient visible-light absorption. Dielectric analysis demonstrated strong polarization and minimal energy loss, facilitating charge retention. Photocatalytic experiments achieved 68.51% RhB degradation in 90 min, following pseudo-first-order kinetics (0.00932 min−1). Reusability tests confirmed 75% efficiency retention after six cycles. These results highlight MnFe2O4 as a promising, stable, and reusable photocatalyst for organic pollutant degradation and environmental remediation under visible light irradiation.